1211021222211 has 24 divisors (see below), whose sum is σ = 1902208224384. Its totient is φ = 739319788800.

The previous prime is 1211021222207. The next prime is 1211021222233. The reversal of 1211021222211 is 1122221201121.

1211021222211 is a `hidden beast` number, since 1 + 211 + 0 + 21 + 222 + 211 = 666.

It is not a de Polignac number, because 1211021222211 - 2² = 1211021222207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211021222291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106956115 + ... + 106967436.

It is an arithmetic number, because the mean of its divisors is an integer number (79258676016).

Almost surely, 2^{1211021222211} is an apocalyptic number.

1211021222211 is a deficient number, since it is larger than the sum of its proper divisors (691187002173).

1211021222211 is a wasteful number, since it uses less digits than its factorization.

1211021222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213923611 (or 213923608 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211021222211 its reverse (1122221201121), we get a palindrome (2333242423332).

The spelling of 1211021222211 in words is "one trillion, two hundred eleven billion, twenty-one million, two hundred twenty-two thousand, two hundred eleven".